In the following code if I define const foo, the code compiles:


import std.algorithm: map;
void main() {
    //const foo = (int x) => x; // OK
    enum foo = (int x) => x; // error
    [1].map!foo;
}


If I use enum foo I receive the error messages, dmd 2.064alpha:


...\dmd2\src\phobos\std\algorithm.d(410): Error: function std.algorithm.MapResult!(int(int x)

{

return x;

}

, int[]).MapResult.back cannot access frame of function D main
...\dmd2\src\phobos\std\algorithm.d(444): Error: function std.algorithm.MapResult!(int(int x)

{

return x;

}

, int[]).MapResult.front cannot access frame of function D main
...\dmd2\src\phobos\std\algorithm.d(456): Error: function std.algorithm.MapResult!(int(int x)

{

return x;

}

, int[]).MapResult.opIndex cannot access frame of function D main
...\dmd2\src\phobos\std\algorithm.d(396): Error: template instance std.algorithm.MapResult!(int(int x)

{

return x;

}

, int[]) error instantiating
bug.d(5):        instantiated from here: map!(int[])
bug.d(5): Error: template instance std.algorithm.map!(int(int x)

{

return x;

}

).map!(int[]) error instantiating



I think a better formatting for those error messages could be:

...\dmd2\src\phobos\std\algorithm.d(410): Error: function std.algorithm.MapResult!(int(int x) { return x; }, int[]).MapResult.back cannot access frame of function D main
...\dmd2\src\phobos\std\algorithm.d(444): Error: function std.algorithm.MapResult!(int(int x) { return x; }, int[]).MapResult.front cannot access frame of function D main
...\dmd2\src\phobos\std\algorithm.d(456): Error: function std.algorithm.MapResult!(int(int x) { return x; }, int[]).MapResult.opIndex cannot access frame of function D main
...\dmd2\src\phobos\std\algorithm.d(396): Error: template instance std.algorithm.MapResult!(int(int x) { return x; }, int[]) error instantiating
bug.d(5):        instantiated from here: map!(int[])
bug.d(5): Error: template instance std.algorithm.map!(int(int x) { return x; }).map!(int[]) error instantiating